Accession Number : ADA627396


Title :   Interactive Acoustic Simulation in Urban and Complex Environments


Descriptive Note : Final rept. 21 Feb 2013-21 Feb 2015


Corporate Author : IMPULSONIC INC CHAPEL HILL NC


Personal Author(s) : Manocha, Dinesh ; Chandak, Anish


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a627396.pdf


Report Date : 21 Mar 2015


Pagination or Media Count : 190


Abstract : Report developed under Topic #A11a-T006, contract W911NF-13-C-0037. Outdoor acoustics simulation plays a vital role in several military and commercial applications. State-of-the-art outdoor acoustics prediction methods are restricted, slow, or limited to simple environments. Specifically, no existing method can simultaneously model atmospheric acoustical phenomena, surface interactions due to complex objects, along with dynamic sound sources and listeners. We developed a multi-domain simulation approach that combines efficient non-linear ray tracing with accurate wave solver to model long-range atmospheric effects as well as scattering due to complex objects. Accurate but computationally expensive wave solver models scattering effects near complex objects, while efficient non-linear ray tracer handles far-field interactions. The results from these solvers are combined using a novel two-way coupling based on equivalent source representation. Our technique is compute and memory efficient, requiring at least 100 times less memory and compute time than prior approaches. We validated our technique by comparing simulation results against analytical solutions and measurement data for outdoor scenes. The resulting acoustic simulation system can be used by the Army and DoD for battlefield planning, training, and simulation systems. It can also be used by federal agencies, acoustical consultants, and architects for urban noise modeling and reduction.


Descriptors :   *ACOUSTIC SCATTERING , *ACOUSTIC WAVES , *COMPUTERIZED SIMULATION , *URBAN AREAS , CARTESIAN COORDINATES , CENTRAL PROCESSING UNITS , COUPLING(INTERACTION) , ERROR ANALYSIS , LOGARITHM FUNCTIONS , MATHEMATICAL PREDICTION , MEASURING INSTRUMENTS , MEMORY DEVICES , METEOROLOGICAL PHENOMENA , MULTIPROCESSORS , NOISE REDUCTION , NONLINEAR SYSTEMS , OPTIMIZATION , OUTDOOR , PROBABILITY , RAY TRACING , SOUND PRESSURE , SOUND TRANSMISSION , VALIDATION , WAVE PROPAGATION


Subject Categories : Statistics and Probability
      Computer Programming and Software
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE